grok-4-fast

completions

byopenrouter

grok-4-fast

completions

Published by: x-aiProvider:

openrouter

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model on xAI's [news post](http://x.ai/news/grok-4-fast). Reasoning can be enabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens) Prompts and completions on Grok 4 Fast Free may be used by xAI or OpenRouter to improve future models.

Context

Input

$0.2 / 1M tokens

Output

$0.5 / 1M tokens

Cached

$0.05 / 1M tokens

Capabilities: tools, reasoning

Accepts: text, image

Returns: text

Context: 2M Input: $0.2 / 1M tokensOutput: $0.5 / 1M tokensCached: $0.05 / 1M tokensCapabilities: tools, reasoningAccepts: text, imageReturns: text

Access grok-4-fast through LangDB AI Gateway

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Code Examples

Integration samples and API usage

Code Samples for grok-4-fast

Python SDK Example:

from openai import OpenAI

client = OpenAI(
    base_url="https://api.us-east-1.langdb.ai/projects/<your_project_id>",
    api_key="<your_api_key>"
)

response = client.chat.completions.create(
    model="grok-4-fast",
    messages=[
        {"role": "user", "content": "Hello, how are you?"}
    ]
)

print(response.choices[0].message.content)

TypeScript SDK Example:

import OpenAI from 'openai';

const client = new OpenAI({
    baseURL: "https://api.us-east-1.langdb.ai/projects/<your_project_id>",
    apiKey: "<your_api_key>"
});

const response = await client.chat.completions.create({
    model: "grok-4-fast",
    messages: [
        { role: "user", content: "Hello, how are you?" }
    ]
});

console.log(response.choices[0].message.content);

cURL Example:

curl -X POST "https://api.us-east-1.langdb.ai/projects/<your_project_id>/v1/chat/completions" \
  -H "Authorization: Bearer <your_api_key>" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "grok-4-fast",
    "messages": [
        {"role": "user", "content": "Hello, how are you?"}
    ]
  }'

Model: grok-4-fast

Provider: openrouter

API Endpoint: $https://api.us-east-1.langdb.ai

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grok-4-fast by openrouter - AI Model Details, Pricing, and Performance Metrics

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